For Android, you can get our beta app by joining our public Android Insiders group. For iOS, you'll first need to install TestFlight on your iOS device. You can find it here or in the App Store. Once TestFlight is installed, you can join from your device. You'll then be able to download and install our beta app via TestFlight.

Learn what to do if you see error 0x803F9006 when you start a game or app on your Xbox console.

This article has guidance for: Organizations with IT-managed Windows devices and updates.

摘要 [/INTEGRITYCHECK 連結器] 選項針對使用者模式可攜式可執行檔 (PE) 檔案提供 Windows 核心數位簽名驗證。 反惡意代碼和防作弊案例需要這個連結器選項，才能向 Windows 安全性 中心註冊元件。

You see the following error code and message when you launch a game or an app on your Xbox console: 0x803f8001

Sign-in options Usage Guidelines URL: Privacy Policy URL: ...

Learn how to fix email issues for error code 5.7.515 when sending email to Outlook.com (the sending domain does not meet the required authentication level).

Use the Information Protection viewer to view protected files in Windows, Android, iOS, or Edge.

Want to add a padlock to your email messages? You can use encryption and digital signatures in new Outlook, classic Outlook, and Outlook on the web for work or school accounts to increase the security of messages. Encrypting an email message in Outlook means it's converted from readable plain text into scrambled cipher text. Only the recipient who has the private key that matches the public ...

You can use drag and drop to open email messages saved with the extension .eml, .msg, .oft in new Outlook for Windows and Outlook on the web.